// Copyright (c) 2022 Presto Labs Pte. Ltd.
// Author: fengyang

#pragma once

#include <algorithm>
#include <functional>
#include <limits>
#include <map>
#include <string>
#include <vector>

#include <boost/algorithm/string.hpp>

#include "coin2/base/string_util.h"
#include "coin2/exchange/base/executor_util/market_ts.h"
#include "coin2/exchange/base/feed/processor.h"
#include "coin2/exchange/feed.pb.h"

namespace coin2::exchange::kucoin::feed_v1 {
namespace impl {

using coin2::exchange::feed::WebsocketConfig;

class KucoinSpotRequestGenerator : public base::feed::RequestGenerator {
 public:
  explicit KucoinSpotRequestGenerator(const WebsocketConfig* ws_config)
      : config_(ws_config) {}

  std::vector<std::string> GenerateRequests(
      const std::vector<std::string>& channels,
      const std::vector<std::string>& symbols,
      const std::map<std::string, std::string>& channel_templates,
      const std::string& request_template) override {
    std::vector<std::string> reqs;
    std::vector<std::string> ch = channels;
    std::vector<std::string> ch_kline;
    auto iter = ch.begin();
    while (iter != ch.end()) {
      if (StringStartsWith(*iter, "kline_rest")) {
        ch_kline.push_back(*iter);
        iter = ch.erase(iter);
      } else {
        iter++;
      }
    }

    auto timestamp = MarketTimestampProvider::GetTimestamp();
    if (!ch_kline.empty()) {
      boost::posix_time::ptime round_time = TimestampRoundHour(timestamp);
      for (auto& ch_k : ch_kline) {
        std::string c = channel_templates.at(ch_k);
        auto interval_time = GetInterval(c);
        for (auto& symbol : symbols) {
          std::vector<std::pair<int64_t, int64_t>> durations;
          std::string length;
          bool long_query = base::feed::RequestGenerator::CheckLongQuery(
              round_time, symbol, ch_k, &last_long_query_time_);
          if (long_query) {
            durations = base::feed::RequestGenerator::GetDurations(
                config_->kline_length(), config_->kline_start(), config_->kline_end(),
                interval_time, 1200);
          } else {
            // query small data
            durations = base::feed::RequestGenerator::GetDurations(
                "3", "", "",interval_time, 1200);
          }

          int idx = 0;
          for (const auto& d : durations) {
            std::string c_copy = c;
            boost::replace_all(c_copy, "{}", symbol);
            boost::replace_all(c_copy, "{end}", std::to_string(d.second / 1'000'000'000L));
            boost::replace_all(c_copy, "{start}", std::to_string(d.first / 1'000'000'000L));
            if (long_query) {
              c_copy.append("&currentPage=").append(std::to_string(idx));
            }
            reqs.emplace_back(c_copy);
            idx++;
          }
        }
      }
    }

    std::vector<std::string> reqs_others = RequestGenerator::GenerateRequests(
        ch, symbols, channel_templates, request_template);
    reqs.insert(reqs.end(), reqs_others.begin(), reqs_others.end());

    return reqs;
  }

 private:
  int64_t GetInterval(const std::string& channel) {
    if (channel.find("type=1min") != std::string::npos) {
      return (int64_t) 60 * 1'000'000'000;
    } else if (channel.find("type=5min") != std::string::npos) {
      return (int64_t) 5 * 60 * 1'000'000'000;
    } else if (channel.find("type=15min") != std::string::npos) {
      return (int64_t) 15 * 60 * 1'000'000'000;
    } else if (channel.find("type=1hour") != std::string::npos) {
      return (int64_t) 60 * 60 * 1'000'000'000;
    } else if (channel.find("type=1day") != std::string::npos) {
      return (int64_t) 24 * 60 * 60 * 1'000'000'000;
    } else {
      THROW() << "Not support new channel: " << channel;
    }

    return std::numeric_limits<int64_t>::quiet_NaN();
  }

  const WebsocketConfig* config_;
};

}  // namespace impl
using impl::KucoinSpotRequestGenerator;
}  // namespace coin2::exchange::kucoin::feed_v1
